Adeuomphalus Seguenza, 1876

(Figure 3)

Adeuomphalus Seguenza, 1876: 10 . Type species (M): A. ammoniformis Sequenza, 1876 . Plio-Pleistocene deep-water fossil, southern Italy. [see Kano et al. (2009) for potential synonymy of Transomalogyra Palazzi & Gaglini, 1979 and unresolved erroneous identification of type species.]

Description. Shell to 3 mm, planispiral, teleoconch with axial cords, aperture D-shaped, with thin edge.

Remarks. The placement of the genus is not fully resolved and is included here under Seguenziidae for convenience; see Kano et al. (2009) for details. Of six species, one is known in the northeast Pacific.

Adeuomphalus trochanter Warén & Bouchet, 2001

(Figure 3)

Adeuomphalus trochanter Warén & Bouchet, 2001: 132, figs 8f, 15l, 16d. Holotype MNHN 21051. Juan de Fuca Ridge, off Oregon (46°N, 130°W), 2068 m.

Description. As for genus.

Distribution. Juan de Fuca Ridge (46˚N). Hydrothermal vents, 2000 m.